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Distributions (Details) - $ / shares
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Distributions                      
Minimum distribution of taxable income (as a percent)                 90.00%    
Ordinary taxable distribution                 $ 2.084 $ 0.349 $ 1.607
Return of capital                     0.444
Unrecaptured Section 1250 gain                 0.132 0.636 0.163
Long-term capital gain                 0.064 1.295 0.066
Total $ 0.57 $ 0.57 $ 0.57 $ 0.57 $ 0.57 $ 0.57 $ 0.57 $ 0.57 $ 2.280 $ 2.280 $ 2.280